公开(公告)号：US4888763A

公开(公告)日：1989-12-19

申请号：US167074

申请日：1988-03-11

申请人： Walter B. Hatfield ,  Nathan Tobol ,  Frederick W. Scholl

发明人： Walter B. Hatfield ,  Nathan Tobol ,  Frederick W. Scholl

IPC分类号： H04L7/06 ,  H04L12/413

CPC分类号： H04L12/413 ,  H04L7/06

摘要： Through the method and apparatus of the present invention the collision of two packets can be detected with a high degree of accuracy under a variety of conditions. The preamble of each packet transmitted is modified to include collision detection data comprising an initial pulse having an amplitude sufficiently high to be detected even when attenuated and having a pulse width twice the normal data pulse width followed by a transceiver code of a predetermined length unique to each transceiver. Thus, in the event two packets collide, the collision may be detected by recognizing a second large pulse within a time period less than the sum of the packet duration and the gap between packets, by determining if a large initial pulse has a pulse width larger than the generated pulse width, and by determining if the transceiver code echoed back to the transmitting transceiver is equal to transceiver code stored in memory on the transceiver. If a transceiver detects a collision, a large collision detect pulse having an amplitude and pulse width similar to the amplitude and pulse width of the large initial pulse is transmitted within the time period less than the sum of the packet duration and interpacket gap, thus assuring that the collision is detected by all transceivers.

摘要翻译： 通过本发明的方法和装置，可以在各种条件下以高精度检测两个分组的冲突。 修改发送的每个分组的前导码，以包括冲突检测数据，其包括具有足够高的振幅的初始脉冲，即使在衰减时也被检测，并且具有两倍于正常数据脉冲宽度的脉冲宽度，后面是具有预定长度的收发器代码， 每个收发器。 因此，在两个分组发生碰撞的情况下，通过确定大的初始脉冲是否具有较大的脉冲宽度，可以通过在小于分组持续时间和分组之间的间隙的总和的时间段内识别第二大脉冲来检测冲突 并且通过确定回送到发射收发器的收发器代码是否等于收发器中存储在存储器中的收发器代码。 如果收发器检测到碰撞，则在小于包持续时间和分组间隙的总和的时间段内传输具有类似于大初始脉冲的幅度和脉冲宽度的幅度和脉冲宽度的大型冲突检测脉冲，从而确保 所有收发器检测到碰撞。

公开(公告)号：US5253252A

公开(公告)日：1993-10-12

申请号：US668363

申请日：1991-03-12

申请人： Nathan Tobol

发明人： Nathan Tobol

IPC分类号： H04J3/06 ,  H04L12/417

CPC分类号： H04J3/0664 ,  H04L12/417

摘要： A token passing media access protocol provides distributed time scheduling. The token provides an indication of each time at which a network device is to perform a cyclic or time critical operation. The token also provides an indication of system time to enable all devices on the network bus to be synchronized. The format of data transmissions on the network bus employs a shortened device address when referencing the device as a source. The source address corresponds to a unique portion of the device address.

摘要翻译： 令牌传递媒体访问协议提供分布式时间调度。 令牌提供网络设备每次执行循环或时间关键操作的指示。 令牌还提供系统时间的指示，以使网络总线上的所有设备能够同步。 当引用设备作为源时，网络总线上的数据传输格式采用缩短的设备地址。 源地址对应于设备地址的唯一部分。

公开(公告)号：US20050185200A1

公开(公告)日：2005-08-25

申请号：US10845923

申请日：2004-05-14

申请人： Nathan Tobol

发明人： Nathan Tobol

IPC分类号： H04N1/60

CPC分类号： H04N1/6058 ,  H04N1/603

摘要： The present invention provides systems, methods, and computer program products for performing color gamut mapping between different color gamuts on a pixel basis. A set of desired parameters is initially defined representing the desired color gamut transformation to which the color values of the pixel are to be mapped. The parameters describe the best-fit lines for the portions of the curve for the gamut transform to which the specific parameters are applied. The present invention next maps the color values used for the pixel in the first color gamut and the color values used for the pixel in the second gamut to the parameters of the transform. The present invention performs mapping by isolating portions of a curve and approximating those portions of the curve with a best straight-line fit. This method of mapping from one color gamut to another color gamut is less computationally intensive than conventional methods.

摘要翻译： 本发明提供了用于基于像素执行不同色域之间的色域映射的系统，方法和计算机程序产品。 最初定义一组期望的参数，表示要映射像素的颜色值的期望色域变换。 这些参数描述了应用了特定参数的色域变换的曲线部分的最佳拟合线。 接下来，本发明将用于第一色域中的像素的颜色值和用于第二色域中的像素的颜色值映射到变换的参数。 本发明通过隔离曲线的部分并以最佳直线拟合近似曲线的那些部分来执行映射。 从一个色域映射到另一个色域的这种方法比传统方法计算量少。

公开(公告)号：US4726026A

公开(公告)日：1988-02-16

申请号：US699751

申请日：1985-02-08

申请人： Michael H. Hilford ,  Nathan Tobol

发明人： Michael H. Hilford ,  Nathan Tobol

IPC分类号： G06F11/18 ,  G06F11/267 ,  H03K19/23 ,  G01R31/28

CPC分类号： G06F11/185 ,  G06F11/2215 ,  H03K19/23

摘要： A majority-voted output circuit generates an output parameter which is the majority vote of its input parameters by series-parallel combination of four intermediate switches, each said switch being a Boolean function of the input parameters, and the circuit being arranged so that failure of any one switch does not affect the value of the output parameter. Alternate embodiments are provided which use "don't care" signals to allow the majority vote of less than the full complement of input parameters. The majority-voted output circuit is subjected to testing by stepped transitions of its input parameters (to test for failure of any of the four intermediate switches) and by forcing current flow through predetermined current paths (to test for failure of a particular electrical connection).

摘要翻译： 多数投票输出电路通过四个中间开关的串并联组合生成输入参数的多数投票，每个所述开关是输入参数的布尔函数，并且电路被布置为使得故障 任何一个开关都不会影响输出参数的值。 提供了替代实施例，其使用“不关心”信号来允许少于输入参数的完整补充的多数投票。 多数投票输出电路经过其输入参数的阶跃转换（以测试四个中间开关中的任一个的故障）并通过强制电流流过预定电流路径进行测试（以测试特定电连接的故障） 。